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Add two tablespoons of butter to a large non-stick skillet over medium-high heat. Add the onion, celery, and red bell pepper and sauté for 4-5 minutes. Remove from the pan to a bowl and set aside.
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Melt another two tablespoons of butter in the same skillet. Reduce the heat to medium.
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Make sure your shrimp is dry. Pat with paper towels if necessary.
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While the butter melts, season the shrimp with 2 tablespoons of Cajun seasoning. Cook the shrimp in batches (so you don't overcrowd the pan) for 30-60 seconds per side. Remove to a plate or bowl and set aside.
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Add the last two tablespoons of butter to the skillet and turn the heat back up to medium-high. After the butter melts, add the rice. Toast the rice until it is light golden brown, stirring frequently. Add the garlic and sauté with the rice for 30 seconds.
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Add the vegetables back to the skillet with the rice and carefully pour in the water, tomato sauce, and remaining Cajun seasoning. Stir to combine.
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Cover, bring to a simmer, and reduce the heat to low. Let cook for 10-15 minutes, or until the liquid is absorbed and the rice is tender.
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Turn the heat off, add the shrimp to the skillet on top of the rice in a single layer, cover, and let sit for 3 minutes.
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Fluff the rice immediately before serving.